Hb
abbr. [军] 厚膛壁身管（Heavy Barrel）
📖 牛津释义
HB
abbr
缩写 = (of lead used in pencils) hard black (ie medium hard) （指铅笔芯）硬黑（即硬度适中）
an HB pencil 一支HB的铅笔. Cf 参看 B, H.
🗣️ 情景例句
What are your weaknesses?
你的缺点是什么？
It's very nice of you to come and see me off.
您来给我送行，真是太客气了。
It's quite likely that a decision will be made before the end of the year.
有可能年底前就要作出决定。